Method for simultaneous transmission of control signals, terminal therefor, method for receiving control signal, and base station therefor

ABSTRACT

The present invention relates to a method and an apparatus allowing a simultaneous transmission of control signals in a wireless communication system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application of U.S. applicationPublication Ser. No. 14/410,553, filed on Dec. 22, 2014, which is aNational Stage Entry of International Application PCT/KR2013/005473,filed on Jun. 21, 2013, and claims priority from and the benefit ofKorean Patent Application No. 10-2012-0066705, filed on Jun. 21, 2012,both of which are incorporated herein by reference for all purposes asif fully set forth herein.

BACKGROUND Field

The present invention relates to a method and apparatus for simultaneoustransmission of control signals in a wireless communication system.

Discussion of the Background

In a wireless communication system, such as, LTE (Long Term Evolution),LTE-A (LTE-Advanced), and the like, control signals, for example,Scheduling Request (SR) information for requesting downlinktransmission, ACK/NACK information for reporting whether downlink datais received, a Channel Status Information (CSI) report for reporting aquality of a downlink channel, and the like, are transmitted from aterminal to a base station through an uplink control channel (forexample, a PUCCH).

For the effective use of electric wave resources, simultaneoustransmission of a SR and an ACK/NACK may be considered. PUCCHtransmission diversity (TxD) may be considered to secure the quality ofa PUCCH, and as one of the methods, SORTD that transmits a controlsignal using two antennas may be considered.

SUMMARY

An aspect of the present invention is to provide a method and apparatusfor simultaneous transmission of control information when a UserEquipment (UE), for which channel selection and SORTD are used as aPUCCH transmission method, is required to simultaneously transmitcontrol signals, that is, an ACK/NACK and a SR.

In accordance with an aspect of the present invention, there is provideda method for a UE to simultaneously transmit control signals, the methodincluding: generating ACK/NACK information indicating whether downlinktransmission is received; and when a scheduling request and the ACK/NACKinformation are simultaneously transmitted, transmitting the ACK/NACKinformation through an uplink control channel resource for a firstantenna using the first antenna, and transmitting the ACK/NACKinformation through an uplink control channel resource for a secondantenna using the second antenna.

In accordance with another aspect of the present invention, there isprovided a UE, including: a control signal generating unit to generateACK/NACK information indicating whether downlink transmission isreceived; and a transceiving unit to transmit the ACK/NACK informationthrough an uplink control channel resource for a first antenna using thefirst antenna and to transmit ACK/NACK information through an uplinkcontrol channel resource for a second antenna using the second antenna,when a scheduling request and the ACK/NACK information aresimultaneously transmitted.

In accordance with another aspect of the present invention, there isprovided a method for a base station to receive a control signal, themethod including: receiving control information through an uplinkcontrol channel resource for a first antenna of a UE and an uplinkcontrol channel resource for a second antenna of the UE when the UEsimultaneously transmits a scheduling request and ACK/NACK informationindicating whether downlink transmission is received; and decoding thecontrol information.

In accordance with another aspect of the present invention, there isprovided a base station, including: a transceiving unit to receivecontrol information through an uplink control channel resource for afirst antenna of a UE and an uplink control channel resource for asecond antenna of the UE when the UE simultaneously transmits ascheduling request and ACK/NACK information indicating whether downlinktransmission is received; and a control signal decoding unit to decodethe control information.

According to the present invention, simultaneous transmission of controlinformation may be supported when a User Equipment (UE) for whichchannel selection and SORTD are set as a PUCCH transmission method, isrequired to simultaneously transmit control signals, that is, anACK/NACK and a SR.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless communication system inwhich a User Equipment (UE) communicates with a base station;

FIG. 2 is a diagram illustrating a method for simultaneous transmissionof a SR and an ACK/NACK in a Carrier Aggregation (CA) environment of aFDD (Frequency Division Duplex) and TDD (Time Division Duplex) system;

FIG. 3 is a diagram illustrating an example in which a single SRresource is added in FDD;

FIG. 4 is a diagram illustrating an example in which a plurality of SRresources is added in FDD;

FIG. 5 is a diagram illustrating another example in which a plurality ofSR resources is added in FDD;

FIG. 6 is a diagram illustrating an example in which a single SRresource is added in TDD;

FIG. 7 illustrates a method of transmitting an uplink control signalaccording to an embodiment of the present invention;

FIG. 8 is a block diagram illustrating a configuration of a base stationaccording to an embodiment of the present invention; and

FIG. 9 is a block diagram illustrating a configuration of a UE accordingto an embodiment of the present invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

Hereinafter, embodiments of the present invention will be described withreference to the accompanying drawings. In the following description,the same elements will be designated by the same reference numeralsalthough they are shown in different drawings. Further, in the followingdescription of the present invention, a detailed description of knownfunctions and configurations incorporated herein will be omitted when itmay make the subject matter of the present invention rather unclear.

FIG. 1 illustrates an example of a wireless communication system inwhich a User Equipment (UE) communicates with a base station.

Referring to FIG. 1, a wireless communication system may include a UserEquipment (UE) 10 and a base station 20 that executes uplink anddownlink communication with the UE 10.

Throughout the specifications, the UE 10 may be an inclusive conceptindicating a user terminal utilized in wireless communication, includinga UE (User Equipment) in WCDMA, LTE, HSPA, and the like, and a MS(Mobile station), a UT (User Terminal), an SS (Subscriber Station), awireless device, and the like in GSM.

The base station 20 may generally refer to a station where communicationwith the UE 10 is performed, and may also be referred to as a Node-B, aneNB (evolved Node-B), a Sector, a Site, a BTS (Base Transceiver System),an Access Point, a Relay Node, and the like.

In addition, the base station 20 may inclusively include variouscoverage areas, such as, a megacell, macrocell, a microcell, a picocell,a femtocell, an RRH (Radio Resource Head), and a relay nodecommunication range, and the like.

The UE 10 may transmit a scheduling request (SR), a HARQ (Hybrid ARQ)A/N (ACK(acknowledge)/NACK(non-acknowledge)) information with respect toa received downlink data channel transmission block, a downlink ChannelStatus Information (CSI) report through an uplink control channel (forexample, a PUCCH (Physical Uplink control CHannel), and may transmituplink data through an uplink data channel (for example, a PUSCH(Physical Uplink Shared CHannel)).

In an LTE (Long Term Evolution) Rel-10 system, PUCCH format 1 may beused for transmission of a SR, PUCCH format 1a/1b may be used fortransmission of an ACK/NACK, PUCCH format 2/2a/2b may be used fortransmission of a CSI report, and PUCCH format 3 may be used fortransmission of a plurality of ACKs/NACKs.

A complex-valued symbol or a modulation symbol d (0) used in PUCCHformat 1/1a/1b are described as follows: In PUCCH format 1 fortransmission of a SR, d(0)=1 is set only when a SR exists (presence) andtransmission may be executed. In PUCCH format 1a, a complex-valuedsymbol d(0) obtained by modulating a single ACK/NACK bit based on BPSK(binary phase shift keying) may be transmitted. In PUCCH format 1b, acomplex-valued symbol d(0) obtained by modulating a single ACK/NACK bitbased on QPSK (quadrature phase shift keying) may be transmitted. InPUCCH format 1a/1b, a modulation symbol d(0) may be as shown in thefollowing Table 1.

TABLE 1 PUCCH format b(0), . . . , b(M_(bit) − 1) d(0) 1a 0  1 1 −1 1b00  1 01 −j 10  j 11 −1

FIG. 2 is a diagram illustrating a method for simultaneous transmissionof a SR and an ACK/NACK in a Carrier Aggregation (CA) environment of anFDD (Frequency Division Duplex) system.

In the example of FIG. 2, a plurality of Component Carriers (CCs) CC0and CC1 may be used for downlink communication. When component carriersCC0 and CC1 operate based on a MIMO (Multiple-Input and Multiple-Output)mode, each of the component carriers CC0 and CC1 generates ACKs/NACKswith respect to two codewords CW0 and CW1, and executes spatial bundlingon the ACKs/NACKs with respect to the two codewords CW0 and CW1. Here,the spatial bundling refers to executing a logical AND operation withrespect to all ACK/NACK information generated in each subframe in asingle serving cell. An ACK/NACK ((b0, b1)) of two bits including abundled ACK/NACK (b0 and b1) of one bit that is generated with respectto each component carrier CC0 and CC1, may be transmitted through PUCCHformat 1b, with reference to Table 1.

When a SR is not transmitted and only an ACK/NACK is transmitted in asingle subframe, the UE 10 may transmit an ACK/NACK (four bits) throughan allocated ACK/NACK PUCCH resource 210, without additional spatialbundling with respect to each component carrier CC0 and CC1. When a SRand an ACK/NACK are simultaneously transmitted, the UE 10 may transmitan ACK/NACK (two bits) through a SR PUCCH resource 220.

For a TDD system, the number of ACKs/NACKs to be transmitted in a singleuplink subframe may be higher (for example, when a plurality of downlinksubframes is associated with a single uplink subframe).

For example, when ACK/NACK with respect to two component carriers and aplurality of downlink subframes are transmitted in a single uplinksubframe, the UE 10 counts the number of ACKs that may be transmitted intwo component carriers (a component carrier in a MIMO transmission modeexecutes counting after spatial bundling), selects b(0), b(1)corresponding to the number of ACKs based on the following Table 2, andsimultaneously transmits information associated with the number of ACKsand SR information through a SR PUCCH resource that is allocated througha higher layer signaling such as an RRC (Radio Resource Control). Amethod of counting ACKs based on Table 2, may be applicable to an A/Nbundling mode, an A/N multiplexing mode, or channel selection.

TABLE 2 Number of ACK among multiple$( {N_{SPS} + {\sum\limits_{c = 0}^{N_{cells}^{DL} - 1}U_{{DAI},c}}} )$b(0), b(1) HARQ-ACK responses 0 or None (UE detect at least one DLassignment is missed) 0, 0 1 1, 1 2 1, 0 3 0, 1 4 1, 1 5 1, 0 6 0, 1 71, 1 8 1, 0 9 0, 1

In Table 2, N_(SPS) may have a value of 0 or 1, based on whether a SPSPDSCH transmission exists within a bundling window. U_(DAI,c) denotesthe number of PDCCHs/EPDCCHs that are transmitted to indicate a PDSCHand SPS release in the serving cell (c) and are received by the UE.

As another example, the method may be used as the A/N multiplexing modein LTE Rel-8 TDD, and the channel selection method that is used for A/Ntransmission in FDD/TDD in CA environment of Rel-10 may be used. Thechannel selection method has a feature of requiring as many PUCCH format1 resources as the number of transmitted A/N bits. Accordingly, a methodof allocating a PUCCH resource may be different based on FDD/TDD,whether a MIMO transmission mode is set for each CC, whether SPS(Semi-Persistent Scheduling) is transmitted, whether self-scheduling isset, and whether cross-scheduling is set. According to the presentmethod, a UE extracts a related PUCCH resource and informationcorresponding to b(0), b(1) from A/N information corresponding to aPDCCH indicating a decoded PDSCH or SPS release, through a channelselection mapping table (for example, Table 3 as shown below), andtransmits the same to a base station through PUCCH format b1.

For example, when it corresponds to FDD and A=2, the following Table 3may be used. Here, A denotes the number of A/N bits to be transmitted.

TABLE 3 HARQ-ACK(0) HARQ-ACK(1) n_(PUCCH) ⁽¹⁾ b(0)b(1) ACK ACKn_(PUCCH,1) ⁽¹⁾ 1, 1 ACK NACK/DTX n_(PUCCH,0) ⁽¹⁾ 1, 1 NACK/DTX ACKn_(PUCCH,1) ⁽¹⁾ 0, 0 NACK NACK/DTX n_(PUCCH,0) ⁽¹⁾ 0, 0 DTX NACK/DTX NoTransmission

For example, when HARQ-ACK(0) is ACK, HARQ-ACK(1) is NACK/DTX,b(0),b(1)=1,1 may be transmitted through PUCCH format 1b in a resourcedetermined based on n_(PUCCH,0) ⁽¹⁾.

Table 3 illustrates an example when A=2, a table associated with a casein which A=3 or 4 may exist.

A Spatial Orthogonal Resource Transmit Diversity (SORTD) technology maybe used for PUCCH transmission. SORTD is a method of transmittingidentical control information through a plurality of transmissionantennas, and each antenna uses different PUCCH resources. The methodgenerally requires the use of PUCCH resources two times greater than atransmission using a single antenna, but may be advantageous in that thereliability of a PUCCH channel that is transmitted in an uplink isimproved.

In an embodiment, in FDD, a SR PUCCH resource for a second antenna AP#1may be allocated in addition to a SR PUCCH resource for a first antennaAP#0 (this may be identical to the SR PUCCH resource of FIG. 2).

FIG. 3 is a diagram illustrating an example in which a single SRresource is added.

A PUCCH resource may be configured using a Frequency DivisionMultiplexing (FDM) and Code Division Multiplexing (CDM). That is, atotal of 36 resources may be code division multiplexed (CDM) usingZadoff-Chu sequence in each of the configured PUCCH Physical ResourceBlock (PRB) pairs.

Referring to FIG. 3, resources for an uplink may include ACK/NACK PUCCHresources 310-1 to 310-4, a SR PUCCH resource 320-1 for the firstantenna AP#0, and a SR PUCCH resource 320-2 for the second antenna AP#1.When SORTD is configured together with channel selection, the SR PUCCHresource 320-2 for the second antenna AP#1 may be additionally allocatedthrough a higher layer signaling such as an RRC.

In the example of FIG. 3, a plurality of component carriers CC0 and CC1may be used for downlink communication. When component carriers CC0 andCC1 operate based on a MIMO transmission mode (when a transmission modethat transmits two codewords is configured), the component carriers CC0and CC1 generate ACKs/NACKs with respect to two codewords CW0 and CW1,and execute spatial bundling with respect to the ACKs/NACKs with respectto the two codewords CW0 and CW1. When a transmission mode thattransmits a single codeword is configured, the spatial bundling is notexecuted. An ACK/NACK ((b0, b1)) of two bits including a bundledACK/NACK (b0 and b1) of one bit that is generated with respect to eachcomponent CC0 and CC1 may be transmitted through PUCCH format 1b, withreference to Table 1.

When a SR is not transmitted and only an ACK/NACK is transmitted in asingle subframe, the UE 10 may transmit an ACK/NACK (four bits) throughallocated ACK/NACK PUCCH resources 310-1 to 310-4, based on a generalchannel selection transmission method.

In a case in which the UE simultaneously transmits a SR and an ACK/NACKin an environment where SORTD and a CA are configured by a base station,the UE 10 transmits ACK/NACK information (two bits) through the SR PUCCHresource 320-1 using the first antenna AP#0, and transmits ACK/NACKinformation (two bits) which is identical to the ACK/NACK informationtransmitted through the first antenna AP#0, through the SR PUCCHresource 320-2 for the second antenna AP#1 using the second antennaAP#1.

The ACK/NACK information b(0), b(1) transmitted in this manner may betransmitted through the SR PUCCH resource 320-1 and 320-2 and thus, thebase station may simultaneously receive the ACK/NACK information and SRinformation reported by the corresponding UE in a single subframe.

Although the above described example illustrates a case in which twocomponent carriers CC0 and CC1 correspond to a two-codeword transmissionmode (with spatial bundling), the method may be applicable to a case inwhich two component elements correspond to a single-codewordtransmission mode (without spatial bundling) or a case in which onecomponent carrier corresponds to a two-codeword transmission mode andthe other component carrier corresponds to a single-codewordtransmission mode.

FIG. 4 is a diagram illustrating an example in which a plurality of SRresources is added.

A PUCCH resource may be configured using a Frequency DivisionMultiplexing (FDM) and Code Division Multiplexing (CDM). That is, atotal of 36 resources may be code division multiplexed (CDM) usingZadoff-Chu sequence in each of the configured PUCCH Physical ResourceBlock (PRB) pairs.

Referring to FIG. 4, resources for an uplink may include ACK/NACK PUCCHresources 410-1 to 410-4 for a first antenna AP#0, ACK/NACK PUCCHresources 410-5 to 410-8 for a second antenna AP#2, and a SR PUCCHresources 420-1 to 420-4 for the first antenna AP#0.

In the example of FIG. 4, the plurality of SR PUCCH resources 420-1 to420-4 receive an allocation of a plurality of SR resources on apredetermined single antenna port or all of the antenna ports andexecute channel selection transmission, on behalf of the existingACK/NACK PUCCH resources 410-1 to 410-4. The number of SR PUCCHresources 420-1 to 420-4 may be equal to the number of ACK/NACK bits ora product of the number of ACK/NACK bits and the number of antennas. Theexample of FIG. 4 is an example of transmission utilizing SR PUCCHresources on a single antenna, and two codewords are transmitted basedon a MIMO transmission mode for each of the two component carriers CC0and CC1 and the number of ACK/NACK bits is four bits and thus, thenumber of SR PUCCH resources may be four.

When a SR is not transmitted and only an ACK/NACK is transmitted in asingle subframe, the UE 10 may transmit an ACK/NACK (four bits) throughallocated ACK/NACK PUCCH resources 410-1 to 410-4 using the firstantenna, and may transmit an ACK/NACK (four bits) that is identical tothe ACK/NACK transmitted through the first antenna, through the ACK/NACKPUCCH resources 410-5 to 410-8 using the second antenna.

In a case in which the UE simultaneously transmits a SR and an ACK/NACKin an environment where SORTD and a CA are configured by the basestation, the UE 10 transmits ACK/NACK information through the SR PUCCHresources 420-1 to 420-4 for the first antenna AP#0 using the firstantenna AP#0, transmits ACK/NACK information through the ACK/NACK PUCCHresources 410-5 to 410-8 for the second antenna AP#1 using the secondantenna AP#1.

The example of FIG. 4 requires a larger amount of resources compared tothe example of FIG. 3, but may be advantageous in that the performanceis improved since transmission is executed without spatial bundling.

FIG. 5 is a diagram illustrating an example in which a plurality of SRresources is added.

A PUCCH resource may be configured using a Frequency DivisionMultiplexing (FDM) and Code Division Multiplexing (CDM). That is, atotal of 36 resources may be code division multiplexed (CDM) usingZadoff-Chu sequence in each of the configured PUCCH Physical ResourceBlock (PRB) pairs.

Referring to FIG. 5, resources for an uplink may include ACK/NACK PUCCHresources 510-1 to 510-4 for a first antenna AP#0, ACK/NACK resources510-5 to 510-8 for a second antenna AP#1, SR PUCCH resources 520-1 to520-4 for the first antenna AP#0, and SR PUCCH resources 520-5 to 520-8for the second antenna AP#1.

In the example of FIG. 5, the plurality of SR PUCCH resources 520-1 to520-8 receive an allocation of a plurality of SR resources on apredetermined single antenna port or all of the antenna ports andexecute channel selection transmission, on behalf of the existingACK/NACK PUCCH resources 510-1 to 510-8. The number of SR PUCCHresources 520-1 to 520-8 may be equal to the number of ACK/NACK bits ora product of the number of ACK/NACK bits and the number of antennas. Theexample of FIG. 5 is an example of transmission utilizing SR PUCCHresources on two antennas, and two codewords are transmitted based on aMIMO transmission mode for each of the two component carriers CC0 andCC1 and the number of ACK/NACK bits is four bits and thus, the number ofSR PUCCH resources may be 8.

When a SR is not transmitted and only an ACK/NACK is transmitted in asingle subframe, the UE 10 transmits ACK/NACK information through theACK/NACK PUCCH resources 510-1 to 510-4 for the first antenna AP#0 usingthe first antenna AP#0, and transmits ACK/NACK information throughACK/NACK PUCCH resources 510-5 to 510-8 for the second antenna AP#1using the second antenna AP #1.

In a case in which the UE simultaneously transmits a SR and an ACK/NACKin an environment where SORTD and a CA are configured by the basestation, the UE 10 transmits ACK/NACK information through the SR PUCCHresources 520-1 to 520-4 for the first antenna AP#0 using the firstantenna AP#0, and transmits ACK/NACK information through the SR PUCCHresources 510-5 to 510-8 for the second antenna AP#1 using the secondantenna AP#1.

The example of FIG. 5 executes transmission through a plurality ofantennas using SR PUCCH resources and may enhance the SR receptionperformance, compared to transmission that utilizes SR PUCCH resourcesthrough only a predetermined antenna as shown in the example of FIG. 4.Therefore, the base station may indicate an additional configuration(for example, the number of available SR PUCCH resources, the number ofantennas or antenna port numbers where SR PUCCH resources may be used)by taking into consideration an amount of SR PUCCH resources required,SR reception performance, downlink throughput, and the like, withreference to a degree of utilization of a SR PUCCH resource, using amethod determined for the UE. Therefore, the base station may select anantenna through which SR information is transmitted to the UE.

An additional SR PUCCH resource that is required for simultaneoustransmission of a SR and ACK/NACK information may be transferred throughuplink signaling such as RRC (Radio Resource Control) signaling.

In addition, the additional SR PUCCH resource may be implicitly orexplicitly transferred through a PDCCH.

For example, in a case of self-scheduling, based on a CCE (controlchannel elements) index of a PDCCH for PDSCH scheduling or a CCE(control channel elements) index of a PDCCH indicating SPS release,which is transmitted on the PCell, a SR PUCCH resource may be inducedusing a CCE index that is different from a CCE index used for the SORTDtransmission corresponding to an existing method of transmitting only anACK/NACK through a plurality of antennas, and channel selectiontransmission. For example, a value obtained by adding a predeterminednumber to a first CCE index n_(CCE) of the PDCCH (for example,n_(CCE)+2, n_(CCE)+3, and the like), or another CCE index may be usedfor additional SR PUCCH resource allocation.

When existing SORTD and the channel selection transmission method aresimultaneously set using an ARI (Acknowledgement Resource indication)that reuses a TPC field in a DCI (Downlink Control Information) thattransmits downlink control information which is transmitted on theSCell, a SR PUCCH resource may be indicated in addition to an explicitresource. For example, as shown in the following Table 4, a value of anARI field (a value of a TPC command for a PUCCH) may indicateinformation n_(PUCCH,j) ⁽¹⁾ associated with a PUCCH resource for anACK/NACK or information (n_(PUCCH,j) ⁽¹⁾,n_(PUCCH,j+1) ⁽¹⁾,n_(PUCCH,j+2)^((1),SR),n_(PUCCH,j+3) ^((1),SR)) associated with a PUCCH resource foran additional SR.

TABLE 4 Value of ‘TPC n_(PUCCH,j) ⁽¹⁾ or command (n_(PUCCH,j) ⁽¹⁾,n_(PUCCH,j+1) ⁽¹⁾, for PUCCH’ n_(PUCCH,j+2) ^((1),SR), n_(PUCCH,j+3)^((1),SR)) ‘00’ The 1st PUCCH resource value configured by the higherlayers ‘01’ The 2^(nd) PUCCH resource value configured by the higherlayers ‘10’ The 3^(rd) PUCCH resource value configured by the higherlayers ‘11’ The 4^(th) PUCCH resource value configured by the higherlayers

As another example, in a case of cross-carrier scheduling, based on aCCE (control channel elements) index of a PDCCH for PDSCH scheduling ora CCE (control channel elements) index of a PDCCH indicating SPSrelease, which is transmitted on the PCell, a SR PUCCH resource may bederived using a CCE index that is different from a CCE index used forthe existing SORTD and the channel selection transmission method. Forexample, a value obtained by adding a predetermined number to a firstCCE index n_(CCE) of the PDCCH (for example, n_(CCE)+2, n_(CCE)+3, andthe like), or another CCE index may be used for additional SR PUCCHresource allocation.

In another embodiment, in TDD, a SR PUCCH resource for a second antennaAP#1 may be allocated in addition to a SR PUCCH resource for a firstantenna AP#0 (this may be identical to the SR PUCCH resource of FIG. 2).

FIG. 6 is a diagram illustrating an example in which a single SRresource is added.

A PUCCH resource may be configured using a Frequency DivisionMultiplexing (FDM) and Code Division Multiplexing (CDM). That is, atotal of 36 resources may be code division multiplexed (CDM) usingZadoff-Chu sequence in each of the configured PUCCH Physical ResourceBlock (PRB) pairs.

Referring to FIG. 6, resources for an uplink may include, for example,ACK/NACK PUCCH resources 610-1 to 610-4, a SR PUCCH resource 620-1 for afirst antenna AP#0, and a SR PUCCH resource 620-2 for a second antennaAP#1, which are distinguished by frequency. When SORTD is configuredtogether with channel selection, the SR PUCCH resource 620-2 for thesecond antenna AP#1 may be additionally allocated through an RRC.

In the example of FIG. 6, the number of downlink subframes associatedwith a predetermined uplink subframe, that is, the number (M) ofdownlink subframes for which an ACK/NACK is transmitted through thepredetermined subframe, is 3, and 2 component carriers CC0 and CC1 maybe used for downlink communication.

In the example of FIG. 6, a TDD configuration may correspond to one of1, 2, 3, 4, and 6 (for TDD configuration 0, M is always 1, and TDDconfiguration 5 does not support the channel selection transmissionmethod). Through the method of simultaneously transmitting an ACK/NACKand a SR in the TDD configuration, ACKs with respect to each downlinksubframe and component carrier may be counted, and b(0), b(1)corresponding to the number of ACKs may be extracted with reference toTable 2. When each component carrier operates in a MIMO mode, spatialbundling may be executed. Otherwise, spatial bundling may not beexecuted.

When a SR is not transmitted and only an ACK/NACK is transmitted in asingle subframe, the UE 10 may transmit an ACK/NACK (four bits) usingallocated ACK/NACK PUCCH resources 610-1 to 610-4, through a singleantenna. When SORTD is used, additional ACK/NACK PUCCH resource may berequired.

When a SR and an ACK/NACK are simultaneously transmitted, the UE 10transmits ACK/NACK information (two bits) through the SR PUCCH resource620-1 for the first antenna AP#0, using the first antenna AP#0, andtransmits ACK/NACK information (two bits) which is identical to theACK/NACK information transmitted using the first antenna AP#0, throughthe SR PUCCH resource 620-2 for the second antenna AP#1 using the secondantenna AP#1.

The ACK/NACK information b(0), b(1) transmitted in this manner may betransmitted through the SR PUCCH resources 620-1 and 620-2 and thus, abase station may simultaneously receive the ACK/NACK information and SRinformation reported by the corresponding UE in a single subframe.

In another embodiment, when PUCCH format 1b is mapped to a PUCCHresource selected through the channel selection method and QPSK symbolinformation of b(0), b(1), phase shifting may be applied to informationthat is allocated to a second slot of a single subframe in the PUCCHformat 1. When an ACK/NACK is transmitted without a SR, ACK/NACKinformation is transmitted based on an identical phase in both a firstslot and a second slot according to the existing channel selectionmethod. However, when an ACK/NACK is transmitted together with a SR,ACK/NACK information may be transmitted based on the existing channelselection method in the first slot, and phase shifting may be applied tothe ACK/NACK information transmitted in the first slot for transmissionin the second slot. The base station may determine whether a SR istransmitted based on whether phase shifting exists between the firstslot and the second slot.

In particular, a complex-valued symbol d(0) of Table 1 may bemultiplexed as a sequence r_(u,v) ^((α) ^({tilde over (p)}) ⁾(n) asshown in the following Equation 1. In this instance, the length of thesequence r_(u,v) ^((α) ^({tilde over (p)}) ⁾(n) may be N_(seq)^(PUCCH)=12, and is CAZAC(Constant Amplitude Zero Auto-Correlation)sequence that is obtained through cyclic shifting by

$\begin{matrix}{{{{\alpha_{\overset{\sim}{p}}( {n_{s},l} )}{y^{(\overset{\sim}{p})}(n)}} = {\frac{1}{\sqrt{P}}{{d(0)} \cdot {r_{u,v}^{(\alpha_{\overset{\sim}{p}})}(n)}}}},{n = 0},1,\ldots,{N_{seq}^{PUCCH} - 1}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

A block y^(({tilde over (p)}))(0), . . . ,y^(({tilde over (p)}))(N_(seq) ^(PUCCH)−1) of the complex-valued symbolsmay be scrambled as a sequence S(n_(s)) as shown in Equation 2, and isspread as an orthogonal sequence w_(n) _(oc) _(({tilde over (p)})) (i)that is defined for each antenna.

z ^(({tilde over (p)}))(m′·N _(SF) ^(PUCCH) ·N _(seq) ^(PUCCH) +m·N_(seq) ^(PUCCH) +n)=S(n _(s))·w _(n) _(oc) _(({tilde over (p)})) (m)·y^(({tilde over (p)}))(n)

m=0, . . . ,N _(SF) ^(PUCCH)−1

n=0, . . . ,N _(seq) ^(PUCCH)−1

m′=0,1  Equation 2

In Equation 2, m′=0 denotes a first slot in a single subframe, and m′=1denotes a second slot in the single subframe. In addition, m denotes anindex of a symbol for PUCCH format 1/1a/1b transmission used in thesingle slot, and a total number of symbols used for PUCCH format 1/1a/1btransmission used in the single slot may be the number N_(SF) ^(PUCCH)of spreading factors (SFs) of an orthogonal sequence. In this instance,for normal PUCCH format 1/1a/1b transmission, N_(SF) ^(PUCCH) is 4. Forshortened PUCCH format 1/1a/1b transmission, N_(SF) ^(PUCCH) is 4 in thefirst slot and N_(SF) ^(PUCCH) is 3 in the second slot n denotes anindex of a subcarrier for PUCCH format 1/1a/1b transmission in a singleresource block (RB), and the total number of subcarriers for PUCCHformat 1/1a/1b transmission in a single resource block (RB) correspondsto a length N_(seq) ^(PUCCH)=12 of a sequence.

The orthogonal sequence w_(n) _(oc) _(({tilde over (p)})) (i) forspreading may be defined by the following Equation 3 and Table 5 (for anormal CP (normal cyclic prefix) or Table 6 (for an extended CP(extended cyclic prefix).

$\begin{matrix}{{n_{oc}^{(\overset{\sim}{p})}( n_{s} )} = \{ \begin{matrix}{{\lfloor {{{n_{\overset{\sim}{p}}^{\prime}( n_{s} )} \cdot \Delta_{shift}^{PUCCH}}\text{/}N^{\prime}} \rfloor + {3 \cdot m^{\prime} \cdot {d(0)}_{SR}}}\mspace{25mu}} & \begin{matrix}{{{for}\mspace{14mu} {normal}}\mspace{20mu}} \\{{cyclic}\mspace{14mu} {prefix}}\end{matrix} \\{{2 \cdot \lfloor {{{n_{\overset{\sim}{p}}^{\prime}( n_{s} )} \cdot \Delta_{shift}^{PUCCH}}\text{/}N^{\prime}} \rfloor} + {3 \cdot m^{\prime} \cdot {d(0)}_{SR}}} & \begin{matrix}{{for}\mspace{14mu} {extended}} \\{{cyclic}\mspace{14mu} {prefix}}\end{matrix}\end{matrix} } & {{Equation}\mspace{14mu} 3}\end{matrix}$

TABLE 5 Sequence index Orthogonal sequences n_(oc)^(({tilde over (p)}))(n_(s)) [w(0) . . . w(N_(SF) ^(PUCCH) − 1)] 0 [+1+1 +1 +1] 1 [+1 −1 +1 −1] 2 [+1 −1 −1 +1] 3 [−1 −1 −1 −1] 4 [−1 +1 −1+1] 5 [−1 +1 +1 −1]

TABLE 6 Sequence index Orthogonal sequences n_(oc)^(({tilde over (p)}))(n_(s)) [w(0) . . . w(N_(SF) ^(PUCCH) − 1)] 0 [+1+1 +1] 1 [1 e^(j2π/3) e^(j4π/3)] 2 [1 e^(j4π/3) e^(j2π/3)] 3 [−1 −1 −1]4 [−1 e^(j5π/3) e^(jπ/3)] 5 [1 e^(jπ/3) e^(j5π/3)]

In Equation 3, Δ_(shift) ^(PUCCH) and N′ are set from a higher layer orset in a system, and may be used for various parameter values used inPUCCH format 1/1a/1b. m′=0 denotes a first slot in a single subframe,and m′=1 denotes a second slot in the single subframe. d(0)_(SR) is aparameter for SR transmission, and d(0)_(SR)=1 when a SR exists, andd(0)_(SR)=0 when a SR does not exist. When a SR is not transmitted,n_(oc) ^(({tilde over (p)}))(n_(s)) may have a value from 0 to 2 in boththe first slot and the second slot. When a SR is transmitted, n_(oc)^(({tilde over (p)}))(n_(s)) may have a value from 0 to 2 in the firstslot and n_(oc) ^(({tilde over (p)}))(n_(s)) may have a value rising by3 in comparison to the first slot, in the second slot.

Alternatively, to generate an identical orthogonal sequence, thefollowing Equation 4 may be used instead of Equation 2, the followingEquation 5 may be used instead of Equation 3, and the following Table 7and Table 8 may be used instead of Table 5 and Table 6.

$\begin{matrix}{{{z^{(\overset{\sim}{p})}( {{m^{\prime} \cdot N_{SF}^{PUCCH} \cdot N_{seq}^{PUCCH}} + {m \cdot N_{seq}^{PUCCH}} + n} )} = {( {- 1} )^{m^{\prime} \cdot {d{(0)}}_{SR}} \cdot {S( n_{s} )} \cdot {w_{n_{oc}^{(\overset{\sim}{p})}}(m)} \cdot {y^{(\overset{\sim}{p})}(n)}}}{{m = 0},\ldots,{N_{SF}^{PUCCH} - 1}}{{n = 0},\ldots,{{N_{seq}^{PUCCH} - m^{\prime}} = 0},1}} & {{Equation}\mspace{14mu} 4} \\{{n_{oc}^{(\overset{\sim}{p})}( n_{s} )} = \{ \begin{matrix}{\lfloor {{{n_{\overset{\sim}{p}}^{\prime}( n_{s} )} \cdot \Delta_{shift}^{PUCCH}}\text{/}N^{\prime}} \rfloor \mspace{25mu}} & \begin{matrix}{{{for}\mspace{14mu} {normal}}\mspace{20mu}} \\{{cyclic}\mspace{14mu} {prefix}}\end{matrix} \\{2 \cdot \lfloor {{{n_{\overset{\sim}{p}}^{\prime}( n_{s} )} \cdot \Delta_{shift}^{PUCCH}}\text{/}N^{\prime}} \rfloor} & \begin{matrix}{{for}\mspace{14mu} {extended}} \\{{cyclic}\mspace{14mu} {prefix}}\end{matrix}\end{matrix} } & {{Equation}\mspace{14mu} 5}\end{matrix}$

TABLE 7 Orthogonal Sequence index Sequence index sequences n_(oc)^(({tilde over (p)}))(n_(s)) n_(oc) ^(({tilde over (p)}))(n_(s)) [w(0) .. . w(N_(SF) ^(PUCCH) − 1)] in 1^(st) slot in 2^(nd) slot [+1 +1 +1 +1+1 +1 +1 +1] 0 ([+1 +1 +1 +1]) 0 ([+1 +1 +1 +1]) [+1 −1 +1 −1 +1 −1 +1−1] 1 ([+1 −1 +1 −1]) 1 ([+1 −1 +1 −1]) [+1 −1 −1 +1 +1 −1 −1 +1] 2 ([+1−1 −1 +1]) 2 ([+1 −1 −1 +1]) [+1 +1 +1 +1 −1 −1 −1 −1] 0 ([+1 +1 +1 +1])3 ([−1 −1 −1 −1]) [+1 −1 +1 −1 −1 +1 −1 +1] 1 ([+1 −1 +1 −1]) 4 ([−1 +1−1 +1]) [+1 −1 −1 +1 −1 +1 +1 −1] 2 ([+1 −1 −1 +1]) 5 ([−1 +1 +1 −1])

TABLE 8 Orthogonal Sequence index Sequence index sequences n_(oc)^(({tilde over (p)}))(n_(s)) n_(oc) ^(({tilde over (p)}))(n_(s)) [w(0) .. . w(N_(SF) ^(PUCCH) − 1)] in 1^(st) slot in 2^(nd) slot [+1 +1 +1 +1+1 +1] 0 ([+1 +1 +1]) 0 ([+1 +1 +1]) [+1 e^(j2π/3) e^(j4π/3) +1e^(j2π/3) e^(j4π/3)] 1 ([1 e^(j2π/3) e^(j4π/3)]) 1 ([1 e^(j2π/3)e^(j4π/3)]) [+1 e^(j4π/3) e^(j2π/3) +1 e^(j4π/3) e^(j2π/3)] 2 ([1e^(j4π/3) e^(j2π/3)]) 2 ([1 e^(j4π/3) e^(j2π/3)]) [+1 +1 +1 −1 −1 −1] 0([+1 +1 +1]) 3 ([−1 −1 −1]) [+1 e^(j2π/3) e^(j4π/3) −1 e^(j5π/3)e^(jπ/3)] 1 ([1 e^(j2π/3) e^(j4π/3)]) 4 ([−1 e^(j5π/3) e^(jπ/3)]) [+1e^(j4π/3) e^(j2π/3) −1 e^(jπ/3) e^(j5π/3)] 2 ([1 e^(j4π/3) e^(j2π/3)]) 5([1 e^(jπ/3) e^(j5π/3)])

In Equation 4, m′=0 denotes a first slot in a single subframe, and m′=1denotes a second slot in the single subframe. d(0)_(SR) is a parameterfor SR transmission, and d(0)_(SR)=1 when a SR exists, and d(0)_(SR)=0when a SR does not exist. When a SR is not transmitted, complex-valuedsymbols in the first slot and the second slot may have an identicalphase. When a SR is transmitted, a complex-valued symbol in the firstslot and a complex-valued symbol in the second slot may have a phasedifference of 180 degrees and have different signs.

FIG. 7 illustrates a method of transmitting an uplink control signalaccording to an embodiment of the present invention.

Referring to FIG. 7, a base station transfers, to a UE, informationassociated with a Carrier Aggregation (CA), channel selection, SORTD, aSR configuration, and the like through an uplink signaling such as anRRC, in operation S710.

The UE determines whether to execute simultaneous transmission of a SRand an ACK/NACK through a PUCCH in a predetermined subframe in operationS720, and when there is a determination to execute the simultaneoustransmission of a SR and an ACK/NACK through a PUCCH, the UEsimultaneously transmits the SR and the ACK.NACK in an identicalsubframe based on one of the above described embodiments in operationS730. In this instance, the SR and the ACK/NACK information may betransmitted through two antennas. The base station decodes the SR andthe ACK/NACK from the received control information in operation S740.

The base station determines whether to retransmit data through a PDSCHbased on the ACK/NACK information and/or whether to transmit a UL grantbased on the SR information, and indicates the determination to the UEin operation S750.

FIG. 8 is a block diagram illustrating a configuration of a base stationaccording to an embodiment of the present invention.

Referring to FIG. 8, a base station 800 includes a configuration settingunit 810, a transceiving unit 820, and a control signal decoding unit830.

The configuration setting unit 810 may set a Carrier Aggregation (CA),channel selection, SORTD, a SR configuration, and the like. Theinformation set in the configuration setting unit 810 may be transferredto the terminal through the transceiving unit 820 using an RRC.

The transceiving unit 820 receives uplink control information from theUE. The control information may include SR information and ACK/NACKinformation. Identical control information may be transferred throughthe two antennas. The control signal decoding unit 830 may decode thecontrol information received by the transceiving unit 820, so as toextract the SR information and the ACK/NACK information.

FIG. 9 is a block diagram illustrating a configuration of a UE accordingto an embodiment of the present invention.

Referring to FIG. 9, a UE 900 includes a transceiving unit 910, aconfiguration information extracting unit 920, and a control signalgenerating unit 930.

The transceiving unit 910 receives, from a base station through an RRC,a signal including information associated with a Carrier Aggregation(CA), channel selection, SORTD, a SR configuration, and the like, andthe configuration information extracting unit 920 extracts theinformation associated with a CA, channel selection, SORTD, and a SRconfiguration, and the like, from the signal.

When simultaneous transmission of SR information and ACK/NACKinformation in a predetermined subframe is required, the control signalgenerating unit 930 generates control information to be transmittedthrough a SR PUCCH resource (or an ACK/NACK PUCCH resource) allocatedeach of the two antennas, and the transceiving unit 910 transmits thecontrol information through configured resources using the two antennas.

Although the technical idea of the present invention has been describedfor illustrative purposes, those skilled in the art will appreciate thatvarious modifications, additions and substitutions are possible, withoutdeparting from the scope and spirit of the invention as disclosed in theaccompanying claims. Therefore, the embodiments disclosed in the presentinvention are intended to illustrate the scope of the technical idea ofthe present invention, and the scope of the present invention is notlimited by the embodiment. The scope of the present invention shall beconstrued on the basis of the accompanying claims in such a manner thatall of the technical ideas included within the scope equivalent to theclaims belong to the present invention.

What is claimed is:
 1. A method for a user equipment to simultaneouslytransmit control signals, the method comprising: generating ACK/NACKinformation indicating whether downlink transmission is received; andwhen a scheduling request and the ACK/NACK information aresimultaneously transmitted, transmitting the ACK/NACK informationthrough an uplink control channel resource for a first antenna using thefirst antenna, and transmitting the ACK/NACK information through anuplink control channel resource for a second antenna using the secondantenna.
 2. The method as claimed in claim 1, wherein the uplink controlchannel resource for the first antenna and the uplink control channelresource for the second antenna correspond to resources configured fortransmission of a scheduling request, or one of the uplink controlchannel resource for the first antenna and the uplink control channelresource for the second antenna corresponds to a resource configured fortransmission of a scheduling request, and the other corresponds to aresource configured for transmission of an ACK/NACK.
 3. The method asclaimed in claim 1, further comprising: receiving configurationinformation of the uplink control channel resource for the secondantenna.
 4. The method as claimed claim 1, further comprising:determining the uplink control channel resource for the second antennabased on a resource where downlink control information is located orinformation included in the downlink control information.
 5. A userequipment, comprising: a control signal generating unit to generateACK/NACK information indicating whether downlink transmission isreceived; and a transceiving unit to transmit the ACK/NACK informationthrough an uplink control channel resource for a first antenna using thefirst antenna and to transmit ACK/NACK information through an uplinkcontrol channel resource for a second antenna using the second antenna,when a scheduling request and the ACK/NACK information aresimultaneously transmitted.
 6. The user equipment as claimed in claim 5,wherein the uplink control channel resource for the first antenna andthe uplink control channel resource for the second antenna correspond toresources configured for transmission of a scheduling request, or one ofthe uplink control channel resource for the first antenna and the uplinkcontrol channel resource for the second antenna corresponds to aresource configured for transmission of a scheduling request and theother corresponds to a resource configured for ACK/NACK transmission. 7.The user equipment as claimed in claim 5, wherein the transceiving unitreceives configuration information of the uplink control channelresource for the second antenna.
 8. The user equipment as claimed inclaim 5, wherein the transceiving unit determines the uplink controlchannel resource for the second antenna, based on a resource wheredownlink control information is located or information included in thedownlink control information.
 9. A method for a base station to receivea control signal, the method comprising: receiving control informationthrough an uplink control channel resource for a first antenna of a userequipment and an uplink control channel resource for a second antenna ofthe user equipment when the user equipment simultaneously transmits ascheduling request and ACK/NACK information indicating whether downlinktransmission is received; and decoding the control information.
 10. Themethod as claimed in claim 9, wherein the uplink control channelresource for the first antenna and the uplink control channel resourcefor the second antenna correspond to resources configured fortransmission of a scheduling request; or one of the uplink controlchannel resource for the first antenna and the uplink control channelresource for the second antenna corresponds to a resource configured fortransmission of a scheduling request, and the other corresponds to aresource configured for transmission of an ACK/NACK.
 11. The method asclaimed in claim 9, further comprising: transmitting configurationinformation of the uplink control channel resource for the secondantenna.
 12. The method as claimed in claim 9, further comprising:determining a resource where downlink control information is located orinformation included in the downlink control information, so as toindicate the uplink control channel resource for the second antenna.